Internal combustion engine



Jan. 3, 1928.

1,655,149 c. L. LEE

INTERNAL COMBUSTION ENGINE Filed April 15, 1922 2 Sheets-Sheet 2 J ga 2 5g? Patented Jan. 3, 1928.

UNITED STATES.

rarsnrorrlce.

CIEt'ARLES L. LEE, or naY'roN. onio ,'assienonro GENERAL Morons nnsnanonconroan'rron, or Darren, onto, a. oonronnrron or IDELAWARE.

INTERILAL-CDMIBUSTION ENGINE.

Application filed s in This. invention relates to internal coinbustion engines and has special reiiercnce to the cooling1neanstherefor.

The cylinder walls and head ot an internal combustionengine are heated both by the high'temperature oi the burning gases within thecylinder itself and by the exhaust gases which are still at a high temperature as they pass out through an e:-:ha'=.ist passage which necessarily m st be connected to the cylinder head or walls.

1 Among the objects of the invention is to relieve the cooling system of a part of its burden by causing a greater amount of heat to be carried out with the exhaust gases so that less will be absorbed by the parts adjacent the exhaust conduit and therefore less to pass to the cooling '1.

Another object oi? this inven ion is to provide means for preventing portions of the engine immediately adjacent the exhaust passage from receiving an recssiveamount of heat from the exhaustgases passing through the exhaustpassage.

Another object is to provide an exhaust duct integralwith the intake duct, the heat insulating means being at or nearthe inner surface of the walls oi? the exhaust duct.

Further objects and advantages ot' the present invention will be apparent from the following description, reference being bad to the accompanying drawings, wherein preferred forms of embodiments oi the present invention are clearly shown.

In the drawings:

Fig. 1 is a transverse section through a cylinder of an engine en'lbodying the invention.

Fig. 2 is a detail view oi theh at insulation linin shown in Fig. v1 as inserted in the exhaust passage.

Fig. 3 is a section on line 33 of 2.

Fig. 4 is a View similar to Fig. 1 but illustrating a modified form of the invention.

Fig. 5 is a section through the modified heat insulation element.

Fig. 6 is an end view of Fig. 5.

In the drawings, similar reference characters refer to similar parts-throughout the several views.

Numeral 1O designates the cylinder having the head 11 and the cooling fins 12 attached thereto. A casting 15, which has integral 1922. eel-1&1 No. 553,105.

therewith the intake duct 16 and the ei-zhaust duct 17 is attached to the cylinder head 11 by any suitable means. The intake valve 18 and the exhaust valve 19 have their *alve stenls 20 and respectively EXtGlltllllg upwardlythrough the casting 15 through the bushing and 23. The valve springs 21 and are mounted upon the upper ends of the llllfllillgii and-Q3 as clearly illustrated. Air cooling fins and 27 may be provided, it desired to prevent the valve springs be coming too hot from heat conducted by the valve stems and bushings. I

A. heat iu'ulation element 30, which may be c. niposcd of lava, porcelain, mica or as bestos composition, or any suitable heat insulating material, is inserted in the exhaust duct 1'7 as a lining. In the embodiment shown the element 30 is preferably made in one piece and the exhaust duct 17 is cut in two at 1-ito permit the insertion 0t clement oa after which the parts of duct 17 are reunitedby any suitable means, such as welding. It desiredthe element 30 may be made in parts so it may be inserted with out cutting cit the elbow 17. Instead of cutting the exhaust duct 17 in two trans- \'*cr:;ely as shown at 1% it may be cut in two down itscenter line by a plane perpendicular to the paper in Fig. 1 in order to permit the insertion of the element 30 and the bottom half of duct 17 again reunited by welding or by other suitable means. Of course this bottom half 03": duct 17 can also be originally made separate from the rest of casting 15 and be later suitably fastened theretoafter the insertion of the heat insulating element, such as by registering lugs on the top and bottom halves and bolts or screws extending through the lugs to hold the halves together. The valve stem bushing 23 is of course inserted through the hole 31. Fig. 3 in the insulating element 30 after it has been inserted in the exhaust passage 17 and aids in holding it in place.

The annular space 9 between the insulating element-3O and the pipe 17 forms an air gap and thus aids in the heat insulation. Preferably this space 9 is provided with a plurality of small air holes 28 and 29 to perheat insulating element represented in its entirety by numeral is cast in the casting 15. There is first formed a tube or pipe 4:1,having the desired shape of the exhaust duct 17, of pressed steel or inichrome or other suitable metal. Around this tube -11 is wrapped asbestos 12 to within a short distance of the ends, this asbestos being held in place by wire or other suitable means. The insulating element 40 thus formed is then used as a core which is inserted in a suitable mould into which metal is poured for forming the caste ing 15. The metal of cas lo welds to the tube 11 at the ends which are not covered with asbestos and thus the element l0, is firmly lined in casting 15. in this modification also the pipe 1? may be provided with small circulating or breather holes 28 and 29 at the top, or bottom, or both as illustrated.

In both forms of embodiment above described an additional heat insulating element or plate may be inserted between the top of the cylinder head 11 and the casting 15. This plate 50 may be formed of asbestos or any other well known heat insulating material, its function being to prevent the high temperature of the cylinder head from reaching the casting 15 and :t'rom thence being conducted to the valve stems bushings and springs. It is obvious that the exhaust gases within passages 17 are also heat insulated from the casting 15 and hence the entire casting 15 will remain relatively cool compared to the cylinder head 11. The valve stems 20, 21 and bushings 22, 23 since they remain comparatively cool will aid in cooling the valves 18 and 19.

While the forms of mechanisms herein shown and described, constitute preferred forms of embodiments of the present invention, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

What I claim is as follows:

1. In combination in an internal combustion engine having a cylinder and an exhaust valve, and with a passa e leading from said cylinder and controlled ny said valve; a tu bular member arranged within said passage and extending along the same lfrom said eithaust valve; and a heat insulating member surrounding said tubular member and adapted to restrain the flow of heat from exhaust gases flowing along said tubular member to the surroumling wall of said exhaust passage.

In combination in an internal combustion engine having a cylinder, a head therefor, intake and exhaust. passages in said head and intake and exhaust valves carried by said head and adapted to control the llow of combustible mixture and of exhaust gases through said passages, and with the exhaust passage aforesaid; a tubular member arranged within said exhaust passage and extending along the same from said exhaust valve; and a heat insulating member interposed between said tubular member and the inner surface of said exhaust passage.

In combination in an internal combustion engine having a cylinder, a head there for, an exhaust passage in said head, and an exhaust valve controlling the How of burned gases through said passage; a continuous tubular member arranged within said passage and extending along the same from said exhaust valve, and which member is spaced apart from the wall of said exhaust passage so as to provide an annular chamber surrounding said tubular member.

In testimony whereof 1 hereto ahix my sig nature.

CHARLES 1L. LEE. 

